![]() ![]() Rapid Exit Taxiway Indicator Lights (RETILs) may be provided to indicate the distance to go to the nearest rapid exit taxiway.The method of provision is specified in ICAO Annex14 Volume 1 ‘Aerodrome Design and Operations’ and the lighting must extend from the landing threshold for either 900 metres or to the midpoint of the runway, whichever is the least. Touchdown Zone (TDZ) Lighting must be provided on runways available for use in low visibility conditions so as to provide enhanced identification of the touchdown area.Such colour coded centreline lighting consists of alternating red and white lights beginning at 900 metres from the runway end and these change to continuous red lights for the last 300 metres of the runway. Runway Centreline Lighting may be provided in which case it will extend for the full length of the runway, It will be white except in the event that colour coding is provided in order to indicate the approaching end of the runway.Red unidirectional edge lights visible only in the direction of runway use are provided at intervals until a further transverse line which marks` the end of the stopway. ![]() Stopway Lighting may be used to show the extent of a stopway beyond the designated end of a runway.Runway Exit taxiways may be indicated by substitution of one or two of the white runway edge lights with blue ones.Various other forms of runway lighting may also be provided, especially if the runway is used for aircraft movements in less than ILS Cat 1 conditions, which require both Low Visibility Procedures (LVP) and, in most cases, specific forms of additional lighting. They are red and can only be seen in the direction of runway use. Runway End Lights are provided in a line along the end of the runway available for use.They are green and can only be seen from the approach. Runway Threshold Lights are provided in a line along the landing threshold at the touchdown end of a runway and define the beginning of the declared Landing Distances.If a runway ‘starter extension’ is provided which is narrower than its associated runway, then blue edge lighting may be used to mark its edges. If a landing threshold is displaced, but the pre-landing threshold area is available for take off, then the edge lights between the beginning of the runway surface and the displaced threshold will be split so as to show red up to the landing threshold whilst still showing white after that point. The lights may be either elevated or embedded in the surface. The area defined may not necessarily be the maximum width of the paved runway surface. Runway Edge Lights are omni-directional and are located along or just beyond the edges of the area declared for use as the runway as defined by edge markings and are white subject to certain specific exceptions.ATC are required to use whatever means are available to them to ensure that they are aware of any lighting system unserviceability so that appropriate notification action can be taken. ICAO guidance requires that runway lighting shall not be operated if a runway is not in use for landing, take-off or taxiing purposes, unless such operation is required for runway inspection or maintenance purposes. Other types of lighting may also be provided. This is referred to as Edge Lighting, Threshold Lighting and Runway End Lighting. All runways licensed for night use must have lighting which at least defines the extent of the runway.
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